In large skillet, heat oil over medium heat. Cook chicken 5 minutes on each side, until golden. In a small bowl, whisk together 1 1/2 cups water, chicken bouillon cube, and remaining flour; pour over chicken . Add spinach and tomato to skillet, and bring to boil. Cover, reduce heat to low, and simmer for 8 to 10 minutes, or until chicken is no longer pink inside.